Accession Number : AD0163971

Title :   Method of Reducing Errors Arising from the Radio Frequency Oscillator System of Optically Pumped Magnetometers.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Hirschel,Louis R.

Report Date : 30 JAN 1973

Pagination or Media Count : 10

Abstract : The patent relates to an optically pumped magnetometer using the phenomenon of multiple photon transitions in helium. Multiple transition makes possible the use of two oscillators of any frequency in an He magnetometer, whose total quantum energy and angular momentum are equivalent to the values required by single-field irradiation. A field at frequency f sub 1 is generated by means of a crystal-controlled oscillator and a field at frequency f sub 2 is generated by a voltage-controlled oscillator such that f sub 1 >> f sub 2, whereby a circularly-polarized field may be generated by the crystal-controlled oscillator, which virtually eliminates the Bloch-Siegert effect and results in a very stable system. To conserve angular momentum in such a system, the two oscillators have their coils mounted perpendicular to one another.

Descriptors :   (*MAGNETOMETERS, *PATENTS), OPTICAL PUMPING, FREQUENCY SHIFT, ERRORS, RADIOFREQUENCY OSCILLATORS, HELIUM

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE